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UNITED STATES PATENT OFFICE.

OTTO A. MOSES, OF NEW YORK, N. Y.

VOLTAlC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 276,704, dated May 1,1883. Application filed October 26, 1882. (No model.)

To all whom it may concern Be it known that I, OTTO A. MOSES, of NewYork city, in the county and State of New York, have invented a certainnew and useful Improvement in Voltaic-Arc Lamps, of which the followingis a specification.

My invention relates to regulating mechanisms for voltaic-arc lamps forregulating the feed of the upper or positive carbon-electrode, whereinthe core or armature of the operating solenoid or magnet is divided, andis located within the carbon-carrying tube, making contact with thewalls of the same, such tube be ing filled with liquid. The parts ofthedivided core or armature repel each other, which action isassisted orintensified by an intensifier located upon the outside of thecarbon-carryin g tube.

The intensifier heretofore employed by me was made in a single solidpiece, and the object of the present invention is such an improvementupon that construction that a more even and uniform movement will beproduced. This I accomplish by the division of the intensifier into anumber of indepeudently-movable parts, which press equally upon thecarhon-holding tube and act evenly upon the magnetic brush or thedivided core or armature of the controlling solenoid or electro-magnet,making a uniform and steady light.

The improved intensifier is composed preferably of a number of balls orrollers of magnetic material, which balls or rollers are held togetherby a wire ring passing loosely through them, so that they have thedesired extent of independent movement. This ring of balls or rollers islimited in its vertical movement by stops or by an inclosingcage, andthe balls or rollers work freely by a rolling movement upon thecarbon-holding tube, as they are attracted by the solenoid orelectro-magnet acting upon the magnetic brush to increase the repulsionbetween its parts. This brush is preferably composed of a number ofwires of magnetic material secured at one end to the core or armatureplaying within the carboncarrying tube, and bearing outwardly againstthe walls of such tube. The action of the solenoid or magnet and theintensifier serves to force the brush with greater or less pressure*into contact with the tube for the purpose of controlling its downwardmovement. The brush or divided core or armature is supported by a springat its upper end, (not shown,) and rests in liquid within thecarbon-holding tube,

the quick and forcible vertical movements of the carbon-holding tubebeing produced by the vertical movements of the brush or divided core orarmature through the medium of the liquid with which the tube is filled.

A further object of the invention is to produce a simple and efficientdevice for holding the lower carbon-electrode ot' the lamp for allowingit to be readily centered or brought into line with the upper carbon,and for peu mitting of an upward adjustment by hand of such lowercarbon. This is accomplished by the employment of a tube in which thelower carbon is placed, the tube being split at its upper end andprovided with a clamping-ring for holding the carbon. This tube hassecured to it, or made in one piece therewith, a disk pro vided with aconcave lower face and resting upon the lower crossbar of thelamp-frame. The tube passes through an opening in the lamp-frame, whichopening is large enough to permit a limited lateral adjustment of thetube in any direction. A disk having a concave upper face is screwedupon the tube, and is forced against the lower side of the cross-pieceof the lamp-frame. The proper position of the lower carbon in line withthe upper carbon can be first secured and the parts then rigidly securedin position by turning up the lower disk. The lower carbon can beadjusted vertically at any time byloosening the clampingring at theupper split end of the tube.

In the accompanying drawings, forming a part hereof, Figure 1 is avertical section of the principal operative parts of the lamp, and Fig.2 a cross-section of the carbon-holding tube above the intensifier.

A is the solenoid or hollow electro-magnet, the coils of which are inseries with the carbon-electrodes. From the head of A rises thesupporting tube 13, carrying a spring (not shown) connected adjustablywith the rod 0, as will be readily understood.

1) is the tube carrying the upper carbonelectrode, E. Thiscarbon-holding tube, which is filled with glycerine or other suitableliquid, F, passes through the solenoid or hollow magnet, being guidedtherein, and enters the supporting-tube B. The rod G extends down intotube D and carries on its lower end the divided core or armature. Thisis composed preferably of a body, G, of magnetic material, to which areattached wires H, also of magnetic material. These wires, forming what 1term the brush, are secured at their upper ends to the body G, andextend downwardly and outwardly into contact with the tube 1).

I is the divided intensifier, limited in its vertical movement by arms(t or a suitable cage. It is composed of balls or rollers b,ot' magneticmaterial, carried by a ring, 0, and surrounding the tubeD. The ringpasses loosely through the rollers, so that they may have an independentmovement thereon. This annular intensifier always retains a horizontalposition and acts uniformly upon the brush. It has a rolling movementupon the carbon-carrying tube, playing freely upon the same. The uppercarbon, E, is attached to the rod D by means of a split socket andclamping-ring, as in said application.

The lower carbon, K, enters a tube, L, provided with a disk, M, having aconcave lower side, (I, as shown. The disk M rests upon the lowercross-piece, N, ofthelampt'rame, through an opening, 0, in which thetube L passes. A disk,O,having a concave upper side, f, screws upon thetube L and strikes the lower side of the cross-piece N. The opening 0 islarge enough to permit the tube L to be moved a limited extent in anyhorizontal direction, in order that the lower carbon may be brought intoline with the upper carbon. The concave faces of the disks assure arigid holding of the parts. The carbon is held in the tube L by ascrew-ring,g, turning upon the split upper end, h, of the tube, and canbe adjusted vertically by loosening such ring, and held at any desiredpoint by again tightening the ring.

What I claim is- 1. In regulators for are-lamps, the dividedintensifier, substantially as set forth.

2. In regulators for arc-lamps, the combination, with the solenoid orelectro-magnet, the carbon-carrying tube, and the inclosed divided coreor armature, of the divided intensifier external to said earboncarryingtube, substantially as set forth.

3. The combination, with the solenoid or electro-magnet, thecarbon-carrying tube, and the inclosed brush, of the annular intensifiercomposed of balls or rollers having a limited independent movement,substantially as set forth.

4. In arc-lainps,the combination, with frame N, having opening c, of thetube L, having carbon-clamp at its upper end, the concave disk attachedto said tube, and the concave disk engaging with a screw-thread on saidtube, substantially as set forth.

This specification signed and witnessed this 11th day of October, 1882.

OTTO A. MUSE Witnesses:

RroHD. Drnn, H. W. SEELY.

